dnsdist -- Denial of service via crafted DoH exchange

2025-09-24 · CVE-2025-30187 · VuXML entry

[email protected] reports: In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources. The offending code was introduced in DNSdist 1.9.0-alpha1 so previous versions are not …

Affected versions

• dnsdist < 1.9.11; >= 2.0.0 < 2.0.1

By system

0 still vulnerable, 1 fixed. Where VuXML applies (FreeBSD, DragonFly, FreeBSD's derivatives) a port is vulnerable while its version is in a range; pkgsrc says itself whether it lists a CVE of this advisory; OpenBSD and MidnightBSD keep no list this site reads, so their row is only an estimate: FreeBSD's ranges applied to upstream's version.